S 口 mmary It is a we1 】 − 1{nown fact that skin injuries after high ・ energy photon beam radiotherapy are attributed to the sec ')ndary e 】 ectron emitted fr〔 〕1n acrylic shadow trays . " , re applied . as a shadow tray materia 】 . a high ・ impact llyioll net used genera1 ] y for tenn 圭 s rackets , Comparative studies on surface doses in radiotherapy with Linac ユOMV 〔 Toshiba>in conjuction w 重 th acrylic trays or the nove [nyioll net tray were carried out , with the facts being reparted below .

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... 王 naCliniCa 】 Setting ( i . e. . g . OUrCe ・ tO ・ Chamber diStanCe 90 Cm 、 tray −tO −SUrfaCe diStance ユ 7Cm . 丘eld SiZe l5 × 15cn12), surface doses at a peak depth 25mm were normalized to the vaiue ln the use of conventional trays 〔 5 mm acrylic 一 ユ 〔 ) mm acrylic )respectively in the following tray occasions . a ) 5mm acrylic 〒 high−impaCt ny ] ( ,n , b) 7mm lead − acrylic −Phigh ・ irnpact nylon , 一 (643 > 一 N 工 工 一 Eleotronio Library Servioe ■